*{margin:0;padding:0}
ul li{list-style:none}
img{margin: 0}
.banner{position: relative;width: 1300px;height: 340px;margin: 100px auto;border: 3px solid #009999;border-radius: 15px}
.banner .b_main{position: relative;width: 1300px;height: 340px;}
.banner .b_main .b_m_pic{position: relative;width: 1300px;height: 340px;}
.b_main .b_m_pic li{position: absolute;width: 1300px;height: 340px;top: 0;left: 0;}/*这里给绝对定位，是为了把li叠在一起*/
/*小圆点的样式*/
.b_list ul{position:absolute;right: 40px;bottom: 30px;}/*这里的ul根据banner定位*/
.b_list ul li{width: 20px;height: 20px;float: left;background: #333;margin-left: 20px;border-radius: 50px;
    border:2px solid white;}
.b_list ul .l_hover,.b_list ul .l_click{border:2px solid #333;background: white}
/*两边耳朵的样式*/
.b_btn div{position: absolute;width: 50px;height:50px;background: rgba(0,0,0,0.7);font-size: 30px;color: white;text-align: center;line-height: 50px;top: 60%;margin-top: -60px;cursor: pointer;}
.b_btn .b_left{left:0;border-radius: 50%}/*移到左边*/
.b_btn .b_right{right:0;border-radius: 50%}/*移到右边*/
img{
    border-radius: 11px;
}